Abstract

We have developed a system that provides monotonic tuning of the higher-order
frequency-dependent phase of ultrashort laser pulses. This technique utilizes
geometric aberrations that arise from adjustments to the relative alignment of
the elements of an air-spaced doublet lens. In a system such as a
diffraction-grating stretcher, the spectral components of the optical pulses are
spatially dispersed, and lens aberrations introduce frequency-dependent phase
shifts. A numerical model of a general chirped-pulsed amplification system has
been developed and verified by comparison with experimental and analytical
results. Numerical results indicating that higher-order phase terms can be
compensated by a properly adjusted air-spaced doublet design within the pulse
stretcher are presented.

References

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